From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 25 Aug 2019 20:44:27 +0000 (+0100)
Subject: document weird int2float bug
X-Git-Tag: ls180-24jan2020~372
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=247604ef2e548361cacccc66a38ff4314fdebdbf;p=ieee754fpu.git

document weird int2float bug
---

diff --git a/src/ieee754/fcvt/int2float.py b/src/ieee754/fcvt/int2float.py
index 232ab7fa..fcf3e34c 100644
--- a/src/ieee754/fcvt/int2float.py
+++ b/src/ieee754/fcvt/int2float.py
@@ -87,6 +87,10 @@ class FPCVTIntToFloatMod(PipeModBase):
             # smaller int to larger FP
             comb += z1.e.eq(msb.e_out)
             comb += z1.m[ms:].eq(msb.m_out[3:])
+
+        # XXX there is some weirdness involving the sign looping back
+        # see graphviz output
+        # http://bugs.libre-riscv.org/show_bug.cgi?id=135
         comb += z1.s.eq(sign)
         comb += z1.create(sign, z1.e, z1.m) # ... here